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llwrrn STATES ATENT FHC.

ENOOH B.

BUTTERWORTH, OF OTTAWA, ONTARIO, CANADA.

UPRiGHT STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 246,367, dated August 30, 1881,

Application filed Apt-H22, 1881. (No model.)

To all whom it may concern:

Be it known that I, ENOCII B. BUTTER- WORTH, of Ottawa, in the Province of Ontario and Dominion of Canada, have invented certain Improvements in Boilers for Steam Heating Apparatus, of which the following is a specification.

My invention relates to an improved upright boiler containing vertical water-tubes and designed more particularly for use in generating low-pressure steam for heating purposes.

My invention consists in a boiler wherein vertical water-tubes depending in pairs from an elevated steam chamber ordruin are coupled together at their lower ends by return bends or couplings, the tubes being sustained at their lower ends upon a base-frame, whereby they are adapted to sustain the steam-drum; in constructing the base-frame or ash-pit with an inwardly-extending flange and arranging the same to sustain the vertical water-tubes and the external casing, as hereinafter described; in a peculiar arrangement of long and short tubes coupled together to encircle the tire-door; in providing the return bends or couplings with ears or lugs secured to the base-frame, to retain the parts in position; and in an external detachable magazine, as hereinafter described. v

Figure 1 represents a vertical central crosssection of my improved boiler. Fig. 2 is a vertical section, illustrating the form and attachment of the removable magazine. Fig. 3 is a vertical central section, showing the construction of the divided central water-tube.

Referring to the drawings, A represents a base or ash-pit constructed of an annular or other suitable form, and provided with a crossbar or bridge-tree, 0, upon which the horizontal rotary fire-grate G is sustained. The base A is also provided with an ash-door or opening, I, in one side, extending above the level of the grate in order to permit the removal of clinker from the upper surface of the latter. Around the interior of the base A, near its top, there is formed a flange or a series of in wardlyprojecting cars, a, which serves to sustain water-tubes, hereinafter described, and also to sustain an outside shell'or casing, D, which surrounds the entire boiler, and which is provided at the top with a smoke-pipe, E, and in one side with a firedoor, F.

G represents a steam-drum, preferably of a circular form in its horizontal section, located in the upper part of the body D and sustained by means of vertical water-tubes, the upper ends of which enter the drum while their lower ends are sustained upon the flange a of the base A. These vertical tubes B and B are arranged in a circular series around the outside of the grate within the body, being coupled together at their lower ends in pairs by means of semicircular couplings I), commonly known in the art as return-bends. The couplings b of the supporting-tubes are provided with necks or studs extended downward through the supporting-flange a, and secured by means of nuts 0, applied to their lower ends beneath the flange; but keys or other fastening devices may be substituted in place of the nuts. The two tubes B and B of each pair are preterably made of different diameters, the increased velocity of the water ascending through the small tube compensating for theincreased capacity of the larger tube, through which the w ater descends more slowly. The smaller tube, B, of each pair is extended upward within the drum, above the upper end of its companion, the better to maintain the circulation of the water through them. This elevation of one tube above the other is to be retained in the event of both tubes being made of the same diameter, as is sometimes the case. At the front of the boiler, where the fire-door F is located, the tubes are arranged, as represented in the drawings, to give free access through the door to the interior of the fire-chamber.

It will be observed that the tubes immediately above the door extend downward from the steam'druin to a point slightly above the door where the return bends or couplings are applied. Below the level of the door short tubes are arranged and coupled together in pairs in the same manner as the tubes above described, the upper ends of these tubes being connected to a cross-tube, K, which is, in turn, connected to vertical tubes L, extending upward past the sides of the door to the steamdrum.

At the center of the boiler one or more tubes, M, are extended downward upon the under side of the steam-drum to a point at a suitable dis tance above the grate. This tube is provided, as shown in Fig with a plug, 6, in the lower end, to permit the removal of solid matter deposited therein, and is also provided with a central vertical division-plate, f, by which the tube is divided into two channels, one for the ascending and the other for the descending water. The upper end of the tube has the portion on one side of the division-plate extended upward above the other side, to insure a proper circulation. There may be any desired number of these tubes M distributed throughout the interior space of the fire-chamber. Those return bends or couplings which do not bear upon the base-frame are provided at the lower ends with central removable screwplugs, g, for the purpose of opening the lower ends of the pipes and permitting the discharge of such solid matter as may be deposited therein.

For the purpose of adapting the boiler to continue in full operation throughout the night, or for other long periods of time, without attention, I provide a supplen'iental detachable magazine to receive and deliver gradually to the fire a large supply of fuel. This magazine,

which may be modified in shape and in other 1 details, is preferably constructed in the form represented in Fig. 2, in which it will be seen to consist of an upright tubular body having its lower end curved laterally for introduction into or through the fire-door of the boiler, and having its upper end provided with a hinged lid for the purpose of closing the same to prevent an upward draft through the mass of coal contained therein.

The lower end of the magazine may be secured in place within the fire-door in any suitable manner, a very simple plan being that shown in the drawings, in which the magazine is provided with flanges to interlock with the edges of the door frame or opening. \Vhen thus constructed the magazine may be applied or removed in an instant.

Having thus described my invention, what I claim is 1. In combination with the base or ashchamber having flange a, the steam-drum and the vertical tubes 13 and B, and the returncouplings provided with downwardly-extending necks secured to the flange a, substantially as shown.

2. In combination with theext erior body having the door in its side, the steam-drum, the pairs of short connected tubes above the door, the series of short connected tubes be low the door, the transverse connection between said short tubes, and the vertical tubes extending from said connection to the steamdrum.

3. In combination with the exterior body or shell D, and the pipes B and B sustaining the steanrdrum, the base or ash-pit A, provided with internal flanges or ears, to, adapted and arranged to sustain both the outside body and the vertical tubes.

4. In a steam-boiler, the combination of the steam-drum and the series of depending water-tubes B and B, coupled together at their lower ends in pairs by return-bends, the upper ends of the tubes B extending above the tubes 13.

5. In a steam-boiler, the combination of a base-frame, a grate therein, an inclosing body or shell mounted upon the base, a steam-drum in the upper part of said body, and watertubes coupled together in pairs at their lower ends, arranged in a circular series around the vgrate and extending from the steam-drum to a support upon the base-frame, whereby they are caused to sustain the steam-drum.

6. In combination with a steam boiler or furnace having a side opening, an upright external magazine, constructed and applied substantially as described, whereby its attachment and removal are permitted at will, thus converting the apparatus into a magazine or non-magazine furnace, as required.

7. In combination with a boiler or furnace having an opening in its side, an external upright detachable magazine provided with lips or flanges to interlock with the door frame or opening, substantially as described and shown, whereby the attachment and removal of the magazine at will are permitted.

lllNOCll BRUCE liU'lTERWOR'lH.

\Vi tn esses C. A. Bnr'rnawon'rn, GEO. A. HAWKINS. 

